

extern int start_udunits();
extern int udunits_start_scan(char* attr, utUnit* unit);
extern int udunits_scan(char* attr);
extern void print_time(double* val,utUnit* unit);
extern int print_converted_times(char* attr,double *times,int length);
extern int convert_time(double* val,int* year,int* month,int* day,int* hour,int* minute,float* second);
